Can simple fish feel pain?

The Lamprey is one of the most primitive vertebrates. Nevertheless, pain receptors responded to painful stimuli, such as puncturing or burning of the skin. The receptors were part of the trigeminal nerve.


simple fish feel pain
REFERENCE
Trigeminal sensory neurons of the sea lamprey, Matthews, G, Wickelgren, w, Journal of comparative physiology, Volume 123, Issue 4, pp 329–333, December 1978
Fish Pain